The magnet and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a magnet which can reduce dispersion in bonding strength, realize large bonding strength and realize effective bonding operation by effectively eliminating setting defect of adhesive which is inactive to a nickel plating film. SOLUTION : A magnet (2) has an R-TM-B rare earth magnet body (4) comprising R (R is one or more kinds of rare earth elements including Y), TM (TM is an Fe-base transition element) and B, a protection film (6) comprising a nickel plating film formed in a surface of the magnet body, and a 0.1 μm or less-thick phosphoric acid film (8) formed through phosphoric acid treatment by using treatment liquid containing no fluoride in a surface of the protection film.